# -*- coding: utf-8 -*-
# בש״ד
#
# Miraflores Blog for Django - Part of the Cuba Libre Project
# Copyright (C) 2009, Joshua "jag" Ginsberg <jag@flowtheory.net>
# 
# Por mi amor, que inspira a mi cada respiración y que echa de Cuba
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import re
from BeautifulSoup import BeautifulSoup, Comment
from django import template
from miraflores.feeds import generate_user_token

register = template.Library()

@register.filter
def truncated(text):
    try:
        idx = text.index('<!-- break -->')
    except ValueError:
        return text
    else:
        return text[:idx]

@register.simple_tag
def feed_user_token(user):
    return generate_user_token(user)

# from http://www.djangosnippets.org/snippets/1655/
@register.filter
def sanitize(value, allowed_tags):
    """Argument should be in form 'tag2:attr1:attr2 tag2:attr1 tag3', where tags
    are allowed HTML tags, and attrs are the allowed attributes for that tag.
    """
    js_regex = re.compile(r'[\s]*(&#x.{1,7})?'.join(list('javascript')))
    allowed_tags = [tag.split(':') for tag in allowed_tags.split()]
    allowed_tags = dict((tag[0], tag[1:]) for tag in allowed_tags)

    soup = BeautifulSoup(value)
    for comment in soup.findAll(text=lambda text: isinstance(text, Comment)):
        comment.extract()

    for tag in soup.findAll(True):
        if tag.name not in allowed_tags:
            tag.hidden = True
        else:
            tag.attrs = [(attr, js_regex.sub('', val)) for attr, val in tag.attrs
                         if attr in allowed_tags[tag.name]]

    return soup.renderContents().decode('utf8')

@register.filter
def obfuscate_email(value):
    return value.replace('@',' at ').replace('.',' dot ')